Dynamo-electric machine.



J. LE DAVIS DYNAMO ELECTRIC MACHINE.

APPLICATION FILED JUNE 14, 1912.

' Patented Oct. 27, 1914.

(\1 Z gvggm v ATfORNEY JOSEPH LE CONTE DAVIS, OF rrr'rsiamtori HOUSE ELECTRIC AND MANUFACTURIN veins.

arana. OFFICE.

, rENNsYi-vANIA, ASSIGNOR T WESJTINGF G COMPANY, A CORPORATION or PENNSYL- DYNAMO-ELECTnIo, madam;

To all whom it may concern Be it known that I, Josiii'zn LE C. DAvIs,

. a citizen of the United States, and aresident of Pittsburgh, in the county of Allegheny and a new and useful Improvement in Dynamo- Electric Machines, of whichthefollowing is' 'tion of Fig. 1,

a specification.

My iifvention relates to dynamo -electric machines and it has specialreference' to motors of the railway type and similar machines which are liable to become overheated in service.

The object of my invention is to provide,

a machine of the class above indicated that shall embody simple and efficient means for automatically preventing the overheating of a any of its operation. L I am aware'that fans and other similar cleparts under varying conditions of vices have formed parts of the rotatable members of dynamo-electric machines, but, so far as T am aware, such machines have not hitherto been provided with/means adapted to be so adjusted astdprodtce either an entirely local circulation 0 air within the frame of an inclosed motor or similar machine or a circulation of air from outside of.

the frame through the heated parts of another point.-

Accord ipg'to my present invention, vide a structure having the above specified a su'table inlet, around the machine andout at characteristics which are of special walue in motors of the railwaytype. t

Figure l of the accompan mg drawingsfis. a partially sectional elevation of a railway motor, embodying my invention. Fig. 2 is a-fragmentary View, corresponding to a porillustrating the deflector adjusted to a different position, and Figs. 3 and 4 are detail views of the damper or grid .which is shown in outline in Fig. 1.

Referring to'the drawings, the machine hereshown comprises a stationary frame 1,

having field magnet coils 2 mounted on po-.

lar projections 3, bearing housings 4 and 5-, and an armature 6 having a laminated core member 7, a winding 8, a commutator cyli11- der 9 and a shaft 10. The armature is rotatively supported in bearings 11 and 12 which are respectively supported in the bearing housings 4 and 5. v

The frame 1 is provided with outlet openings 13 and 14 throughthe housing'5, open-" Specification of Letters Patent.

State of Pennsylvania, have invented.

ings 15 and16 whicl are closed bygcommutator covers 17 and 18, and an inlet 19 through which cool air may the interiorfof the motor frame.

1e' laminated core member 7 of the armature is pro'yided with V 20, and a bushing 21, on which the comnintator cylinder 9 is mounted, is provided withpassa'ges 22 to register with thepassages 20. i

Adefiector ring 23 ismounted on the shaft 10 adjacent to the bearing 11, and a combined fan and deflector 24 is mounted on the shaftlO adjacent to the bearin'g12. A'deector 25 is removably secured to the housing 5 by means o'fbo1ts'26 and is adapted to be reversed 5 to direct \the created the fan 24, when themotor is in operation, either outwardly through the openings 13 and 14 or inwardly througha passage 27 between the housing wand the adjacent end of the winding 8 (see Fig. 2). If'thejframe 1 is composed of two separable parts, access to the member 25 for effecting its reversal may be hadby separating such parts, but,

removing some of the The n at" 19 is provided with a damper I procomprisinga stationary grid 28 secured to the frame 1 by bolts 29 and a sliding grid 1 the bolts 29 but is a apted to slide longitudinally with reference to the grid 28' and either register with it to provide fa series of openings 31 or to cover the openings in the under and thus close the-inlet 19. f If the motor operates under a street car or many other position where it is liable to be exposed to the weather, the inlet opening 19' should be closed in the winter when snow is likely to enter. The deflector 25 should then be mounted as shown in Fig. 2. Assuming that the motor is operating 11 er these condition s, the fan 24 produces a circulation of air from the longitudinal passages 20 and 22 outwardly through the fan and the passages 27, back between the polar projections 3 of the *field frame and around the field coils over-the outer surface of the commutetor cylinder 9 and through passages 32 to the passages 22. The circulation of air thus createdserves to prevent overheating of any whiclrlis held in dpositio'n by the heads of Patented Oct. 2'7, 1914. Application filed June 14, 1e'1 g. Serial mi voaeae.

cirdulation of air be admitted to longitudinal passages if the frame is of the one-piece; or so-called box type, access may be had to the member 25 for effecting its reversal by open the of the parts of the otor by maintaining all of the parts at a substantially uniform temperature. Furthermore, the closed circulation will 'usually be maintained only when there is danger of snow entering the motor and, consequently, when the temperature of the outside atmosphere, which is in contact With the exposed surfaces of the motor frame, is relatively low. It may also be found desirable to utilize the closed circulation when'the motor .is subjected to large quantities of dust and grit.

When there is no danger of snow or other foreign matter entering the motor frame, the grid 30 is preferably so adjusted as to inlet openings 31 and the'deflector 25 is changed to the position shown in Fig. l.

"Vhen the motor is operating, under these conditions, the fan 24 forces the air outwardly from the passages 22 and 20 through the" openings 13 and 14 in the housing 5. The hot air from the interior ofthe motor 'is thus continually removed and is replaced by relativelycool air which enters through the inlet 19, passes between the polar pro-- jections 3 and around the 'field magnet coils 2, over the outersurface of the commutator cylinder and through the passages 32,

While my inventionis particularly well adapted for use with motors of the railway type, it is not limited for use in connection with any size machine, and'I desire that only such limitaions shall be imposed as are indicated in the appended claims.

I clalm as my Invention:

1. A motor comprlsing a stationary member, arotatable member, a substantiallyclosed casing, means for creating a circulation 'of air as the motor operates,.andad-Y justable means for directing the circulation of air veither in a closed-circuit within the frame or;in an ppen'circuit including passages in the 'stationaryand-rotatable parts of the motor, and an opening to the outside atmosphere.

2. A dynamo-electr c machme comprising a. stator, an inclosing casing, a rotor, means for creating a circulation of air as themotor operates, mg the c1rculat1on' of am either in a closed 'ing adapted to be small inlet and outlet openings,

carried thereby, a reversiortype of dynamo-electric small inlet and outlet openings,

and adjustable means for directcircuit within the frame or in an open circuit including passages in the stator and rotor of the machine and an opening to'the outside atmosphere, j

3. A dynamo-electric machine comprising a stator, an inclosing casing, forming a part of the rotatable member for creating a circulation of air, and adjustable means for directing the circulation of air either in a closed circuit within the frame or in an open circuit including passagesin the stator and rotor of the machine, and an opening to theoutside atmosphere. 7

1. An electric motor comprising a suhstantially closed frame having relatively small inlet and outlet openings, a rotatable member, a fan carried bynsaid member, a deflector secured to the stationary frame and an adjustable damper for closing and opening the inlet in'the. frame, the deflector be,- reversed and the damper to be adjusted to effect either a closed circulation of air within the casing or an open circulation through the inlet and outlet bpenings. 7

An electric motor comprising a substantially closed frame having relatively a rotatable armature, a frame ble deflector secured to the stationary frame for directing the circulation. of air produced by the fan, and an adjustable damper for closing and opening the inlet in 'the frame.

6. An electric motorcomprismg a substantially closed frame having relatively a rotatable armature, a framecarrled thereby, a reversible deflector secured to the stationar frame fordirecting the circulation of' air produced by the fan, and an adjustable damper for closing and opening the lnlet 1n the frame according to the. position occupied by the deflector.

In testimony Whereof,'I' have hereunto subscribed my name this 4th day of dune,

J OSERH I CONTE DAVIS.

Witnesses: V i

Jo n: S. DEAN, B. B. IllNES.

a rotor, means v 

